Replicating 'eye strain' effect

I've searched for how to do this but the problem may be I don't know how to describe it. I'm trying to replicate an effect I've seen on Tshirts and in print some times. Normally it is applied to text. It looks like you took some text, sliced in horizontally into many rows, and then shifted all the odd rows to offest them from the even rows. The result, which I'll bet most folks have seen, is that the eye has a hard time reading the text. It is very disconcerting.

I want to try this with a simple piece of line art in Photoshop CS2. I can imagine making a copy of the line art on a second layer and then, and this seems to be the hardest part, creating a mask that is a fine set of alternating white and black horizontal lines. It seems I once saw the technique for doing this but I can't track it down.

Any suggestions appreciated.

You can easily make the horizontal lines by going to Filter>Sketch>Halftone Pattern>Line.

Ah, I know the one.

Filter>pixelate>fragment

That's the one I've seen on most shirts.

Ed,

That works perfect to do what I wanted to do. Nice controls for the line width and contrast.

Thanks, I don't think I would have ever found that function buried down there!

Mousewrites,

Thanks for your input too. I tried that but could find no parameters for adjustments and what it did was soften the drawing but it didn't work for the amount of control I need. I will have to try it on some other things, however.

Again, thanks all